<nz-layout>
  <nz-header>
    <!-- 头部module -->
      <app-header></app-header>
  </nz-header>
  <nz-layout>
    <nz-sider>
      <app-sider></app-sider>
    </nz-sider>
    <nz-content>
      <app-message></app-message>
    </nz-content>
  </nz-layout>
  <nz-footer>Footer</nz-footer>
</nz-layout>